Ecumenical Patriarch Olympianos

Ecumenical Patriarch Olympianos (140-198) was the Ecumenical Patriarch of Constantinople from 187 to 198, succeeding Ecumenical Patriarch Pertinax and preceding Ecumenical Patriarch Markos.

Biography
Olympianos was made the Bishop of the See of Byzantium in 187 AD, and during his reign Emperor Septimius Severus took over the city from Pescennius Niger and made it a part of Heraclea Cybistra. For over 100 years, Byzantium was a bishopric under Heraclea.